|Basic info||Taxonomic history||Classification||Included Taxa|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Collections (5 total)
|Time interval||Ma||Country or state||Original ID and collection number|
|Namurian - Westphalian A||Spain (Leon)||S. sp. (37358)|
|Westphalian A||Netherlands||S. laevis (37497)|
|Westphalian A||United Kingdom (England)||S. halifaxensis (37382) S. sulcata (37369 37376)|